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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">chemicallytech</journal-id><journal-title-group><journal-title xml:lang="en">Fine Chemical Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Тонкие химические технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-6593</issn><issn pub-type="epub">2686-7575</issn><publisher><publisher-name>MIREA – Russian Technological University (RTU MIREA).</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2410-6593-2016-11-5-65-69</article-id><article-id custom-type="elpub" pub-id-type="custom">chemicallytech-50</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>THEORETICAL BASIS OF CHEMICAL TECHNOLOGY</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТЕОРЕТИЧЕСКИЕ ОСНОВЫ ХИМИЧЕСКОЙ ТЕХНОЛОГИИ</subject></subj-group></article-categories><title-group><article-title>THE STRATEGY OF STUDYING THREE-LIQUID PHASE EQUILIBRIA IN THE CONCENTRATION SPACE OF QUATERNARY MIXTURES</article-title><trans-title-group xml:lang="ru"><trans-title>АЛГОРИТМ ИССЛЕДОВАНИЯ ОБЛАСТИ ТРЕХФАЗНОГО РАССЛАИВАНИЯ В КОНЦЕНТРАЦИОННОМ ПРОСТРАНСТВЕ ЧЕТЫРЕХКОМПОНЕНТНОЙ СИСТЕМЫ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Себякин</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Sebyakin</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант, Кафедра химии и технологии основного органического синтеза</p><p> </p></bio><bio xml:lang="en"><p>Moscow, 119571 Russia</p></bio><email xlink:type="simple">a.sebyakin@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фролкова</surname><given-names>А. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Frolkova</surname><given-names>A. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>заведующий кафедрой,Кафедра химии и технологии основного органического синтеза</p><p> </p></bio><bio xml:lang="en"><p>Moscow, 119571 Russia</p></bio><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский технологический университет (Институт тонких химических технологий)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Moscow Technological University (Institute of Fine Chemical Technologies)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>28</day><month>10</month><year>2016</year></pub-date><volume>11</volume><issue>5</issue><fpage>65</fpage><lpage>69</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Sebyakin A.Y., Frolkova A.K., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Себякин А.Ю., Фролкова А.К.</copyright-holder><copyright-holder xml:lang="en">Sebyakin A.Y., Frolkova A.K.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.finechem-mirea.ru/jour/article/view/50">https://www.finechem-mirea.ru/jour/article/view/50</self-uri><abstract><p>When separating multicomponent heterogeneous mixtures in units consisting of a distillation column and a decanter, a fundamental question is the location of phase separation regions with different numbers of liquid phases in the concentration simplex. A solution of this issue is based on data on the vapor-liquid and liquid-liquid equilibria of the mixture and its components, as well as on the general laws of the formation of the topological structure of phase separation areas. A strategy of studying the three-liquid phase equilibrium area in quaternary mixtures is proposed. The strategy is based on the formula of a topological invariant of the separation region and on the mathematical concept of centroid - the intersection point of three medians. The presence of threeliquid phase areas of separation of open and closed types is shown. They differ in the absence (presence) of region of degeneracy via the critical node.</p></abstract><trans-abstract xml:lang="ru"><p>При разделении многокомпонентных расслаивающихся смесей в неоднородных комплексах, включающих ректификационные колонны и флорентийские сосуды, принципиальным является вопрос о расположении областей расслаивания с разным числом жидких фаз в концентрационном симплексе. Решение указанного вопроса базируется на данных о фазовых равновесиях жидкость-пар и жидкость-жидкость в системе и ее составляющих, а также на общих закономерностях формирования топологической структуры областей расслаивания. В работе предложен метод и алгоритм исследования области равновесия трех жидких фаз в концентрационном тетраэдре, основанный на формуле топологического инварианта области расслаивания и математического понятия центроида - точки пересечения трех медиан. Показано наличие областей трехфазного расслаивания открытого и закрытого типов, различающихся отсутствием (наличием) вырождения области через критическую ноду.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>область трехфазного расслаивания</kwd><kwd>структура диаграммы</kwd><kwd>математическое моделирование</kwd></kwd-group><kwd-group xml:lang="en"><kwd>three-phase separation region</kwd><kwd>phase diagram structure</kwd><kwd>mathematical simulation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Жаров В.Т., Серафимов Л.А. Физико-химические основы дистилляции и ректификации. Л.: Химия, 1975. 240 с.</mixed-citation><mixed-citation xml:lang="en">Zharov V.T., Serafimov L.A. Fiziko-khimicheskie osnovy distillyacii i rektifikacii (Physico-chemical fundamentals of distillation and  rectification). 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